Vertical combustion accelerating grate



Jan. 20, 1953 F. M. POOR 2,625,894

VERTICAL COMBUSTION ACCELERATING GRATE Filed Jan. 24, 1946 2 SHEETSSHEET l INVENTOR. FEED M- PO Z .w BY

HIS ATmzA/EY.

Jan. 20, 1953 V F. M. POOR 2,625,894

VERTICAL COMBUSTION ACCELERATING GRATE Filed Jan. 24, 1946 I 2 SHEETS--SHEET 2 INVENTOR.

E250 M- Poaz Ms A 7' TOE/VL- Y Patented Jan. 20, 1953 OFFICE VERTICAL COMBUSTION ACCELERATING GRATE Fred M. Poor, Seattle, Wash; Carrie Elsie Poor executrix of said Fred M. Poor, deceased Application January 24, 1946, Serial No. 643,132

1 Claim. 1

This invention relates to an auxiliary device for accelerating burning and is used in addition to the usual grate of a furnace, being placed against the side wall of the firebox thereof or may be used a ainst the inner wall of an incinerator or other furnace for burning coal, sawdust, refuse or other materials.

Various devices have been used in combination with furnaces and grates for accelerating the draft thereof by injecting air into the fire, and louvers have been placed through furnace walls for the same urpose. but any device positioned directly in a fire is subject to intense heat and also subject to scale formations and clinkers, so that in order to function continuously and at the same time be efficient the walls thereof must be solid and relatively heavy and the outlet openings comparatively large and protected by overhanging shelves or projections.

As grates of this type are substantially submerged or covered with the material being burned, it is not suflicient to rely upon ordinary draft, and this invention. contemplates connecting a forced draft duct directly to the interior wherein air is forced horizontally outward into the burning materials.

Where the grate is used in a coal furnace in which it is placed upon the usual grate, the corners of the back at the bottom are cut away providing open areas above the fiat grate, thereby insuring a considerable amount of air on the grate.

As a further means of expediting the velocity of air from the grate to the furnace, the usual grate is covered with a substantial layer of ashes, thereby blockin normal draft and forcing all of the air for combustion upward through the grate and into the upper portion of the material being burned.

The size of the firebox of a furnace is normally computed in proportion to the size of the building and for this reason an auxiliary grate for this purpose should occupy as little space as possible. The grate of this invention is relatively thin with openings in the outer rounded surface only and with the back solid and positioned against the inner surface or wall of the firebox.

The purpose of this invention is to accelerate burning by providing additional air for combustion throughout the upper portions of materials being burned.

Another object is to provide an auxiliary combustion accelerating grate having outlet openings in which the said openings are protected and of sufficient size to prevent their being closed by clinkers, scale and the like.

A fu ther ob ect of the invention is toprovide an auxiliary combustion accelerating grate that may be used in the side or sides of a furnace, incinerator or the like in which the walls thereof are relatively heavy to prevent warping and cracking b the intense heat.

With these ends in view, the invention embodies a relatively heavy solid unit with the back wall substantially straight vertically and curved laterally to correspond with the curvature of the inner wall of a firebox in which it may be placed, and with the outer surface sloping and provided with heavy overhanging ledges and relatively large outlet openin s below and protected by the ledges.

For a full and more complete understanding of the invention, reference may be had to the following description and accompanying drawings, wherein:

Figure 1 is a front elevation of the grate.

Figure 2 is a side elevation with part broken away, showing a section thereof.

Figure 3 is a plan view, showing a section through the rate, taken on line 3-3 of Fi ure 2.

Figure 4 illustrates the use of the grate of Figure 1 in comb nation with an air duct as used in an incinerator or the like in which the grate is shown in elevation. I

Figure 5 illustrates the grate which is shown in elevation in a permanent installation in which it is included in the firebrick lining thereof.

Figure 6 is. a detail showing the grate installed in the firebri-ck wherein the grate is shown in elevation.

Figure '7 is a rear elevation of the lower por tion of the grate with parts broken away.

Referring now to the drawings wherein like reference characters denote corresponding parts, numeral H) indicates the body of the grate, numeral II the outlet openings and numeral if. the overhanging protecting ledges.

The grate is formed with a relatively thin back (3, that may be curved as shown in Figure 3, preferably to correspond with the inner surface of the firebox of a furnace, and the outer surface is formed by the overhanging ledges l2 which are relatively heavy. It will be noted in Figure 2 that these ledges are relatively thick and heavy in cross section, and being heavy they will not be subject to warping or breaking and will therefore protect the openings below. It is contemplated that the grate be made of a casting, however, it may be made of a forging, or fabricated, or made of any other material.

The ledges ii are formed with curved upper surfaces as shown in Figure 2 and below the lower edges are relatively large openings I I, having connecting webs Id at the center, and extending from the webs continuously across the front and to points spaced a short distance from the sides. These openings are relatively large and are not readily closed by intense heat, clinkers, or molten materials running down the surface of the grate. The upper end l5 of the grate is closed and is also formed of relatively heavy material. A flange I6 is provided at the base, which may be omitted when the device is used upon a grate or may be embedded in the ground when the device is used in an incinerator. The flange I 5 stops at the points I! at the front, and the ends thereof are spaced from the back, providing an opening l8 at the back through which it is possible for air to pass to the interior of the grate to increase the air flow on the grates.

In Figure 4, the grate I0 is illustrated as used in an incinerator and is used in combination with a forced air supply in which the air may be provided through a pipe or duct 24. A depending plate 25 may be bolted to the flange I 5 around the base of the grate, providing an enclosed area communicating with the duct 24. With the flange and plate embedded in the ground, the base is substantially sealed and forced air entering the interior from the duct will pass upward and will be injected outward horizontally into the fire or materials being burned in the incinerator 25.

In the design illustrated in Figures 5 and 6, the grate Ill is installed in the firebrick lining 21 of a firebox 28 of a furnace 29. In this design a pipe 24 is connected to the lower end of the grate with the end of the pipe communicating with the interior of the grate whereby air may be forced upward through the grate and into the fire. This connection may be achieved by the plate 25 which is bolted to the flange l6 and is connected to the duct 24. It will be understood that the grate may be used in a furnace of any other type.

As brought out in Figures 1, 2 and 9, the flange l5 extends only around the front and sides of the grate, leaving an open back. Thus, when the plate 25 is secured to this flange, as by bolting, in the form of invention shown in Figure 6, there is an opening l8 with which the conduit 24 communicates. That portion of the space on either side of the conduit 24 is closed by the ground,

cement or other material in which the conduit 24 is imbedded. This same condition holds true for Figures 7 and 8.

The construction and use of the grate will be readily understood from the description. The grate is relatively thin and high so that it will occupy as little space as possible and at the same time will extend upward through the fire, providing means for supplying additional air for combustion to the materials and also to the flash point or fire. By supplying sufficient quantities of air with sufficient velocity, it is possible to completely burn the material with substantially no ash deposit. The temperature, however, is relatively high and, therefore, for this use the grate must be a relatively heavy casting and the air outlet openings large and protected from downwardly dropping materials and particularly from devices such as nails and glass reduced to the molten state by the intense heat.

While a preferred specific embodiment of the invention is hereinbefore set forth, it is to be clearly understood that the invention is not to be limited to the exact construction illustrated and described because various modifications of these details may be provided in putting the invention into practice within the purview of the appended claim.

What is claimed is:

In combination, a structure having a combustion chamber defined by a vertical wall and a bottom,avertical combustion accelerating grate com-- prising a hollow body positioned above said bottom and bearing against said side wall, and which body is of gradually diminishing cross section towards the top thereof, said body having a curved exposed surface formed with a series of overhanging ledges with a relatively large opening beneath each of said ledges, a flange integrally joined to the lower end of said body over a distance corresponding to said curved front surface leaving an open back, a sheet of metal secured to said flange, said flange and sheet of metal being imbedded in said bottom, and a conduit communicating with said open back for supplying air to said grate at the bottom thereof.

FRED M. POOR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 777,331 Carrigan Dec. 13, 198% 964,502 Drummono. July 19, 1910 1,530,772 Heffernan Mar. 24-, 1925 2,116,024 Helmick May 3, 1938 FOREIGN PATENTS Number Country Date 28,693 Great Britain of 1896 534,836 France Jan. 13, 1922 820,380 France July 2", 1937 

